Western Mountaineering Bison Gore Windstop -40C Winter Down Sleeping Bag - Unisex


Western Mountaineering Bison Gore Windstop -40C Winter Down Sleeping Bag - Unisex

  • Available prices From $1305.00 to $1335.00 $1305.00 – $1335.00

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Shop with confidence. If its not working out like you expected, you can return it

Really. If it's not up to snuff after you use it (a couple times) you can still bring it back.

It lasts longer than 30 days, but not forever. We'll be fair about it. We're all members here.


Show Description

Named for a beast that survived ice ages, the bison is crammed with almost a kilo of heat-trapping down. Designed for Denali, Aconcagua, the Himalaya, or anywhere that mistakes could be really quite dire. Huge V-block side baffles and horizontal baffles across your chest hold the down in place. Double interlocking draft tubes and a filled collar seal in heat and security while frigid winds snuffle around the tent.

  • Shell, collar, and draft tube are GORE™ WINDSTOPPER® fabric, which is light, compressible, and impervious to the elements.
  • Deep hood is well filled, and has a large integral hood ruff to seal your face from the elements.
  • Offset, insulated double draft tubes ensure the down doesn't migrate and create cold spots.
  • #5 YKK locking zipper.

Tech specs

Show Tech specs
  • 2.09kg (Regular Left Zip)
  • 2.18kg (Long Left Zip)
Ideal for Winter and expedition camping
Seasons Winter (-15°C to -40°C)

The number of average sized people that the product can comfortably sleep.

Temperature -40°C
Shape Mummy
Insulation 850+ fill-power goose down
Down weight

The amount of down used to fill the product (measured in grams and given for size medium bags).

Technology GORE-TEX Windstopper
Construction Baffle
Face fabric 30-denier nylon
Lining/backer 20-denier nylon
Packed size 28 x 55cm

The thickness or puffiness of a bag – a key factor in determing a bag's warmth.

Shoulder girth 163cm
Hip girth 140cm
Foot girth 99cm
  • Regular fits to 6' 0" (183 cm)
  • Long fits to 6' 6" (198 cm)

An insulated collar that covers yours neck and shoulders to reduce heat loss.

Additional feature(s)
  • Draft tube behind zipper
  • Stuff sack included
  • DWR-treated shell fabric
Made in USA